Foamed abrasive element and method of producing the same

Abstract

A foamed abrasive element comprises a bond of a crosslinked and hardened unsaturated polyester resin and abrasive grains dispersed in the bond and having a porosity of 10 to 80% and a compressive modulus of 10 2 to 10 5 kg/cm 2 . A method of foamed abrasive element is also disclosed.

What is claimed is: 
     
       1. A foamed abrasive element comprising a bond of a crosslinked and hardened unsaturated polyester resin modified with a thermosetting resin selected from the group consisting of polyurethane resin, resol-type phenol resin and mixtures thereof and abrasive grains dispersed in the bond and having a porosity of 10 to 80% and a compressive modulus of 10 2  to 10 5  kg/cm 2 . 
     
     
       2. A method of producing a foamed abrasive element which comprises preparing a mixture containing at least an unsaturated polyester resin modified with a thermosetting resin selected from the group consisting of polyurethane resin, resol-type phenol resin and mixtures thereof, a crosslinking agent and a hardening agent therefor, abrasive grains, and a foaming agent, and foaming and hardening the mixture, to produce a foamed abrasive element having a porosity of 10 to 80% and a compressive modulus of 10 2  to 10 5  kg/cm 2 . 
     
     
       3. A method as in claim 1, wherein the mixture further contains a thermosetting resin. 
     
     
       4. The method of claim 2 wherein the foaming agent is a chemically composable foaming agent. 
     
     
       5. The method of claim 3 wherein the foaming agent is a chemically composable foaming agent.